Commit | Line | Data |
---|---|---|
94d7c01a | 1 | /* Functions for memory limit warnings. |
9ec0b715 | 2 | Copyright (C) 1990, 1992, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
5df4f04c | 3 | 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
94d7c01a JA |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
94d7c01a | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
94d7c01a JA |
11 | |
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
94d7c01a | 19 | |
3b672b8f | 20 | #ifdef emacs |
18160b98 | 21 | #include <config.h> |
d7306fe6 | 22 | #include <setjmp.h> |
94d7c01a | 23 | #include "lisp.h" |
3b672b8f RS |
24 | #endif |
25 | ||
26 | #ifndef emacs | |
27 | #include <stddef.h> | |
28 | typedef size_t SIZE; | |
29 | typedef void *POINTER; | |
30 | #define EXCEEDS_LISP_PTR(x) 0 | |
31 | #endif | |
32 | ||
e231fd42 | 33 | #include "mem-limits.h" |
94d7c01a | 34 | |
933f22f4 RS |
35 | #ifdef HAVE_GETRLIMIT |
36 | #include <sys/resource.h> | |
37 | #endif | |
38 | ||
94d7c01a JA |
39 | /* |
40 | Level number of warnings already issued. | |
41 | 0 -- no warnings issued. | |
42 | 1 -- 75% warning already issued. | |
43 | 2 -- 85% warning already issued. | |
3b672b8f | 44 | 3 -- 95% warning issued; keep warning frequently. |
94d7c01a | 45 | */ |
395d3972 RS |
46 | enum warnlevel { not_warned, warned_75, warned_85, warned_95 }; |
47 | ||
48 | static enum warnlevel warnlevel; | |
94d7c01a JA |
49 | |
50 | /* Function to call to issue a warning; | |
51 | 0 means don't issue them. */ | |
da396c5e | 52 | static void (*warn_function) (); |
94d7c01a | 53 | |
395d3972 RS |
54 | /* Start of data space; can be changed by calling malloc_init. */ |
55 | static POINTER data_space_start; | |
56 | ||
57 | /* Number of bytes of writable memory we can expect to be able to get. */ | |
58 | static unsigned long lim_data; | |
59 | \f | |
60 | ||
61 | #ifdef NO_LIM_DATA | |
62 | static void | |
63 | get_lim_data () | |
64 | { | |
65 | lim_data = -1; | |
66 | } | |
67 | #else /* not NO_LIM_DATA */ | |
68 | ||
51757187 AS |
69 | #if defined (HAVE_GETRLIMIT) && defined (RLIMIT_AS) |
70 | static void | |
71 | get_lim_data () | |
72 | { | |
73 | struct rlimit rlimit; | |
74 | ||
75 | getrlimit (RLIMIT_AS, &rlimit); | |
76 | if (rlimit.rlim_cur == RLIM_INFINITY) | |
77 | lim_data = -1; | |
78 | else | |
79 | lim_data = rlimit.rlim_cur; | |
80 | } | |
81 | ||
82 | #else /* not HAVE_GETRLIMIT */ | |
83 | ||
395d3972 RS |
84 | #ifdef USG |
85 | ||
86 | static void | |
87 | get_lim_data () | |
88 | { | |
89 | extern long ulimit (); | |
90 | ||
91 | lim_data = -1; | |
92 | ||
93 | /* Use the ulimit call, if we seem to have it. */ | |
94 | #if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX) | |
95 | lim_data = ulimit (3, 0); | |
96 | #endif | |
97 | ||
98 | /* If that didn't work, just use the macro's value. */ | |
99 | #ifdef ULIMIT_BREAK_VALUE | |
100 | if (lim_data == -1) | |
101 | lim_data = ULIMIT_BREAK_VALUE; | |
102 | #endif | |
103 | ||
104 | lim_data -= (long) data_space_start; | |
105 | } | |
106 | ||
107 | #else /* not USG */ | |
108 | #ifdef WINDOWSNT | |
109 | ||
110 | static void | |
111 | get_lim_data () | |
112 | { | |
113 | extern unsigned long reserved_heap_size; | |
114 | lim_data = reserved_heap_size; | |
115 | } | |
116 | ||
117 | #else | |
118 | #if !defined (BSD4_2) && !defined (__osf__) | |
119 | ||
120 | #ifdef MSDOS | |
121 | void | |
122 | get_lim_data () | |
123 | { | |
124 | _go32_dpmi_meminfo info; | |
8a445f76 | 125 | unsigned long lim1, lim2; |
395d3972 RS |
126 | |
127 | _go32_dpmi_get_free_memory_information (&info); | |
8a445f76 EZ |
128 | /* DPMI server of Windows NT and its descendants reports in |
129 | info.available_memory a much lower amount that is really | |
130 | available, which causes bogus "past 95% of memory limit" | |
131 | warnings. Try to overcome that via circumstantial evidence. */ | |
132 | lim1 = info.available_memory; | |
7cf94eac | 133 | lim2 = info.available_physical_pages; |
8a445f76 EZ |
134 | /* DPMI Spec: "Fields that are unavailable will hold -1." */ |
135 | if ((long)lim1 == -1L) | |
136 | lim1 = 0; | |
137 | if ((long)lim2 == -1L) | |
138 | lim2 = 0; | |
7cf94eac EZ |
139 | else |
140 | lim2 *= 4096; | |
8a445f76 EZ |
141 | /* Surely, the available memory is at least what we have physically |
142 | available, right? */ | |
7cf94eac | 143 | if (lim1 >= lim2) |
8a445f76 EZ |
144 | lim_data = lim1; |
145 | else | |
146 | lim_data = lim2; | |
147 | /* Don't believe they will give us more that 0.5 GB. */ | |
7cf94eac EZ |
148 | if (lim_data > 512U * 1024U * 1024U) |
149 | lim_data = 512U * 1024U * 1024U; | |
395d3972 | 150 | } |
ec06ec19 EZ |
151 | |
152 | unsigned long | |
153 | ret_lim_data () | |
154 | { | |
155 | get_lim_data (); | |
156 | return lim_data; | |
157 | } | |
395d3972 RS |
158 | #else /* not MSDOS */ |
159 | static void | |
160 | get_lim_data () | |
161 | { | |
162 | lim_data = vlimit (LIM_DATA, -1); | |
163 | } | |
164 | #endif /* not MSDOS */ | |
165 | ||
166 | #else /* BSD4_2 */ | |
167 | ||
168 | static void | |
169 | get_lim_data () | |
170 | { | |
171 | struct rlimit XXrlimit; | |
172 | ||
173 | getrlimit (RLIMIT_DATA, &XXrlimit); | |
174 | #ifdef RLIM_INFINITY | |
175 | lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */ | |
176 | #else | |
177 | lim_data = XXrlimit.rlim_cur; /* soft limit */ | |
178 | #endif | |
179 | } | |
180 | #endif /* BSD4_2 */ | |
181 | #endif /* not WINDOWSNT */ | |
182 | #endif /* not USG */ | |
51757187 | 183 | #endif /* not HAVE_GETRLIMIT */ |
395d3972 RS |
184 | #endif /* not NO_LIM_DATA */ |
185 | \f | |
186 | /* Verify amount of memory available, complaining if we're near the end. */ | |
94d7c01a | 187 | |
fd065466 RM |
188 | static void |
189 | check_memory_limits () | |
94d7c01a | 190 | { |
968e9c04 AI |
191 | #ifdef REL_ALLOC |
192 | extern POINTER (*real_morecore) (); | |
193 | #endif | |
134994ae RM |
194 | extern POINTER (*__morecore) (); |
195 | ||
94d7c01a | 196 | register POINTER cp; |
46b3623d RS |
197 | unsigned long five_percent; |
198 | unsigned long data_size; | |
395d3972 | 199 | enum warnlevel new_warnlevel; |
94d7c01a JA |
200 | |
201 | if (lim_data == 0) | |
202 | get_lim_data (); | |
3b672b8f | 203 | five_percent = lim_data / 20; |
94d7c01a JA |
204 | |
205 | /* Find current end of memory and issue warning if getting near max */ | |
968e9c04 AI |
206 | #ifdef REL_ALLOC |
207 | if (real_morecore) | |
208 | cp = (char *) (*real_morecore) (0); | |
209 | else | |
210 | #endif | |
fd065466 | 211 | cp = (char *) (*__morecore) (0); |
da396c5e | 212 | data_size = (char *) cp - (char *) data_space_start; |
94d7c01a | 213 | |
395d3972 RS |
214 | if (!warn_function) |
215 | return; | |
216 | ||
217 | /* What level of warning does current memory usage demand? */ | |
21da04c4 CY |
218 | new_warnlevel |
219 | = (data_size > five_percent * 19) ? warned_95 | |
220 | : (data_size > five_percent * 17) ? warned_85 | |
221 | : (data_size > five_percent * 15) ? warned_75 | |
222 | : not_warned; | |
395d3972 RS |
223 | |
224 | /* If we have gone up a level, give the appropriate warning. */ | |
225 | if (new_warnlevel > warnlevel || new_warnlevel == warned_95) | |
226 | { | |
227 | warnlevel = new_warnlevel; | |
228 | switch (warnlevel) | |
229 | { | |
230 | case warned_75: | |
231 | (*warn_function) ("Warning: past 75% of memory limit"); | |
232 | break; | |
233 | ||
234 | case warned_85: | |
235 | (*warn_function) ("Warning: past 85% of memory limit"); | |
236 | break; | |
237 | ||
238 | case warned_95: | |
239 | (*warn_function) ("Warning: past 95% of memory limit"); | |
240 | } | |
241 | } | |
242 | /* Handle going down in usage levels, with some hysteresis. */ | |
243 | else | |
244 | { | |
245 | /* If we go down below 70% full, issue another 75% warning | |
246 | when we go up again. */ | |
247 | if (data_size < five_percent * 14) | |
248 | warnlevel = not_warned; | |
249 | /* If we go down below 80% full, issue another 85% warning | |
250 | when we go up again. */ | |
251 | else if (warnlevel > warned_75 && data_size < five_percent * 16) | |
252 | warnlevel = warned_75; | |
253 | /* If we go down below 90% full, issue another 95% warning | |
254 | when we go up again. */ | |
255 | else if (warnlevel > warned_85 && data_size < five_percent * 18) | |
256 | warnlevel = warned_85; | |
257 | } | |
3b672b8f RS |
258 | |
259 | if (EXCEEDS_LISP_PTR (cp)) | |
da396c5e | 260 | (*warn_function) ("Warning: memory in use exceeds lisp pointer size"); |
94d7c01a | 261 | } |
395d3972 RS |
262 | \f |
263 | /* Enable memory usage warnings. | |
264 | START says where the end of pure storage is. | |
265 | WARNFUN specifies the function to call to issue a warning. */ | |
94d7c01a JA |
266 | |
267 | void | |
3b672b8f | 268 | memory_warnings (start, warnfun) |
94d7c01a JA |
269 | POINTER start; |
270 | void (*warnfun) (); | |
271 | { | |
fd065466 | 272 | extern void (* __after_morecore_hook) (); /* From gmalloc.c */ |
94d7c01a JA |
273 | |
274 | if (start) | |
275 | data_space_start = start; | |
3b672b8f RS |
276 | else |
277 | data_space_start = start_of_data (); | |
278 | ||
da396c5e | 279 | warn_function = warnfun; |
fd065466 | 280 | __after_morecore_hook = check_memory_limits; |
b78e8d0a | 281 | |
b78e8d0a AI |
282 | /* Force data limit to be recalculated on each run. */ |
283 | lim_data = 0; | |
94d7c01a | 284 | } |
ab5796a9 MB |
285 | |
286 | /* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5 | |
287 | (do not change this comment) */ |